multimedia/libva-nvidia-driver: still need LIBVA_DRIVER_NAME on Xorg
DRI2DriverDRI returns "nvidia" when NOT using "modesetting" DDX.
libva info: Trying to open /usr/local/lib/dri/nvidia_drv_video.so
libva info: va_openDriver() returns -1
vaInitialize failed with error code -1 (unknown libva error),exit
Reported by: rhurlin